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Search: id:A078560
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| A078560 |
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Denominator of product_{i=1}^n (p_i+1)/(p_i-1). Numerators are in A078559. |
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+0
2
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| 1, 1, 1, 1, 5, 5, 10, 1, 11, 11, 11, 11, 55, 5, 115, 1495, 8671, 43355, 476905, 16691675, 16691675, 43398355, 254190365, 559218803, 559218803, 13980470075, 1075420775, 56997301075, 1036314565, 1036314565, 1036314565, 6123676975
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OFFSET
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1,5
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COMMENT
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a(n)=A005867(n)/A078558(n)
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REFERENCES
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R. K. Guy, Unsolved Problems in Number Theory, B48.
F. Smarandache, "Only Problems, not Solutions!", Xiquan Publ., Phoenix-Chicago, 1993
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LINKS
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F. Smarandache, Only Problems, Not Solutions!.
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CROSSREFS
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Cf. A000203, A002110, A000005, A005867, A054640, A020492, A078558, A078559.
Sequence in context: A147047 A097910 A049122 this_sequence A040021 A003882 A166598
Adjacent sequences: A078557 A078558 A078559 this_sequence A078561 A078562 A078563
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KEYWORD
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nonn,frac
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Dec 06 2002
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EXTENSIONS
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Improved definition from Frank Adams-Watters (FrankTAW(AT)Netscape.net), Dec 02 2005
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